<?php

namespace Tests\Unit;

use App\Models\UserCoupon;
use App\Services\CouponService;
use Tests\TestCase;
use Illuminate\Support\Facades\DB;

/**
 * 优惠券服务单元测试
 *
 * 测试 CouponService 的核心业务逻辑:
 *   - 优惠券发放条件判断
 *   - 优惠券验证
 *   - 金币计算
 *   - 优惠券使用
 */
class CouponServiceTest extends TestCase
{
    /** @var CouponService */
    protected $service;

    /** @var int 测试用户ID */
    protected $testUserId = 999999;

    public function setUp(): void
    {
        parent::setUp();
        $this->service = new CouponService();

        // 清理测试数据
        DB::connection('write')->table(UserCoupon::TABLE)
            ->where('user_id', $this->testUserId)
            ->delete();
    }

    public function tearDown(): void
    {
        // 清理测试数据
        DB::connection('write')->table(UserCoupon::TABLE)
            ->where('user_id', $this->testUserId)
            ->delete();

        parent::tearDown();
    }

    // ========================
    // 固定金额券 - 金币计算
    // ========================

    /**
     * 测试固定金额券：赠送金额等于券面值
     */
    public function test_calc_bonus_coins_fixed_type()
    {
        $coupon = (object) [
            'coupon_type'  => UserCoupon::TYPE_FIXED,
            'coupon_value' => 10.00,  // 10元
            'max_bonus'    => 0,
        ];

        $bonus = $this->service->calcBonusCoins($coupon, 50.00);
        $this->assertEquals(1000, $bonus); // 10元 × 100 = 1000分
    }

    /**
     * 测试固定金额券：不同充值金额，赠送不变
     */
    public function test_calc_bonus_coins_fixed_independent_of_pay_amt()
    {
        $coupon = (object) [
            'coupon_type'  => UserCoupon::TYPE_FIXED,
            'coupon_value' => 5.00,
            'max_bonus'    => 0,
        ];

        $bonus1 = $this->service->calcBonusCoins($coupon, 10.00);
        $bonus2 = $this->service->calcBonusCoins($coupon, 100.00);
        $this->assertEquals($bonus1, $bonus2); // 固定金额与充值额无关
        $this->assertEquals(500, $bonus1);
    }

    // ========================
    // 百分比券 - 金币计算
    // ========================

    /**
     * 测试百分比券：按充值金额百分比计算
     */
    public function test_calc_bonus_coins_percent_type()
    {
        $coupon = (object) [
            'coupon_type'  => UserCoupon::TYPE_PERCENT,
            'coupon_value' => 50,    // 50%
            'max_bonus'    => 100,   // 上限100元
        ];

        $bonus = $this->service->calcBonusCoins($coupon, 40.00);
        $this->assertEquals(2000, $bonus); // 40 × 50% × 100 = 2000分
    }

    /**
     * 测试百分比券：超过上限时按上限计算
     */
    public function test_calc_bonus_coins_percent_capped_at_max()
    {
        $coupon = (object) [
            'coupon_type'  => UserCoupon::TYPE_PERCENT,
            'coupon_value' => 50,
            'max_bonus'    => 30,    // 上限30元
        ];

        // 充值200元，50% = 100元，但上限30元 → 3000分
        $bonus = $this->service->calcBonusCoins($coupon, 200.00);
        $this->assertEquals(3000, $bonus); // 30 × 100 = 3000分
    }

    // ========================
    // 优惠券验证
    // ========================

    /**
     * 测试验证：优惠券不存在
     */
    public function test_validate_coupon_not_found()
    {
        $result = $this->service->validateCoupon(99999, $this->testUserId, 50.00);
        $this->assertFalse($result['valid']);
        $this->assertEquals('Coupon not found', $result['error']);
    }

    /**
     * 测试验证：充值金额不满足最低门槛
     */
    public function test_validate_coupon_below_min_recharge()
    {
        // 手动插入一张测试券
        $couponId = DB::connection('write')->table(UserCoupon::TABLE)->insertGetId([
            'user_id'      => $this->testUserId,
            'coupon_name'  => 'test_fixed',
            'coupon_type'  => UserCoupon::TYPE_FIXED,
            'coupon_value' => 10.00,
            'min_recharge' => 50.00,  // 最低50元
            'max_bonus'    => 0,
            'bonus_coins'  => 0,
            'order_sn'     => '',
            'status'       => UserCoupon::STATUS_UNUSED,
            'issued_at'    => date('Y-m-d H:i:s'),
            'used_at'      => null,
            'expire_at'    => date('Y-m-d H:i:s', strtotime('+7 days')),
        ]);

        $result = $this->service->validateCoupon($couponId, $this->testUserId, 20.00); // 20 < 50
        $this->assertFalse($result['valid']);
        $this->assertStringContainsString('Minimum recharge', $result['error']);
    }

    /**
     * 测试验证：优惠券已过期
     */
    public function test_validate_coupon_expired()
    {
        $couponId = DB::connection('write')->table(UserCoupon::TABLE)->insertGetId([
            'user_id'      => $this->testUserId,
            'coupon_name'  => 'test_expired',
            'coupon_type'  => UserCoupon::TYPE_FIXED,
            'coupon_value' => 10.00,
            'min_recharge' => 0,
            'max_bonus'    => 0,
            'bonus_coins'  => 0,
            'order_sn'     => '',
            'status'       => UserCoupon::STATUS_UNUSED,
            'issued_at'    => date('Y-m-d H:i:s', strtotime('-10 days')),
            'used_at'      => null,
            'expire_at'    => date('Y-m-d H:i:s', strtotime('-1 day')), // 已过期
        ]);

        $result = $this->service->validateCoupon($couponId, $this->testUserId, 50.00);
        $this->assertFalse($result['valid']);
        $this->assertEquals('Coupon expired', $result['error']);
    }

    /**
     * 测试验证：有效优惠券
     */
    public function test_validate_coupon_valid()
    {
        $couponId = DB::connection('write')->table(UserCoupon::TABLE)->insertGetId([
            'user_id'      => $this->testUserId,
            'coupon_name'  => 'test_valid',
            'coupon_type'  => UserCoupon::TYPE_FIXED,
            'coupon_value' => 10.00,
            'min_recharge' => 30.00,
            'max_bonus'    => 0,
            'bonus_coins'  => 0,
            'order_sn'     => '',
            'status'       => UserCoupon::STATUS_UNUSED,
            'issued_at'    => date('Y-m-d H:i:s'),
            'used_at'      => null,
            'expire_at'    => date('Y-m-d H:i:s', strtotime('+7 days')),
        ]);

        $result = $this->service->validateCoupon($couponId, $this->testUserId, 50.00);
        $this->assertTrue($result['valid']);
    }

    // ========================
    // 防重复发放
    // ========================

    /**
     * 测试 hasSameCoupon：有效券存在时返回 true
     */
    public function test_has_same_coupon_returns_true_when_valid_exists()
    {
        $couponName = 'test_duplicate_check';
        DB::connection('write')->table(UserCoupon::TABLE)->insert([
            'user_id'      => $this->testUserId,
            'coupon_name'  => $couponName,
            'coupon_type'  => UserCoupon::TYPE_FIXED,
            'coupon_value' => 5.00,
            'min_recharge' => 0,
            'max_bonus'    => 0,
            'bonus_coins'  => 0,
            'order_sn'     => '',
            'status'       => UserCoupon::STATUS_UNUSED,
            'issued_at'    => date('Y-m-d H:i:s'),
            'used_at'      => null,
            'expire_at'    => date('Y-m-d H:i:s', strtotime('+7 days')),
        ]);

        $this->assertTrue(UserCoupon::hasSameCoupon($this->testUserId, $couponName));
    }

    /**
     * 测试 hasSameCoupon：同名券已过期时返回 false（允许重新发放）
     */
    public function test_has_same_coupon_returns_false_when_expired()
    {
        $couponName = 'test_expired_dup';
        DB::connection('write')->table(UserCoupon::TABLE)->insert([
            'user_id'      => $this->testUserId,
            'coupon_name'  => $couponName,
            'coupon_type'  => UserCoupon::TYPE_FIXED,
            'coupon_value' => 5.00,
            'min_recharge' => 0,
            'max_bonus'    => 0,
            'bonus_coins'  => 0,
            'order_sn'     => '',
            'status'       => UserCoupon::STATUS_UNUSED,
            'issued_at'    => date('Y-m-d H:i:s', strtotime('-10 days')),
            'used_at'      => null,
            'expire_at'    => date('Y-m-d H:i:s', strtotime('-1 day')), // 已过期
        ]);

        $this->assertFalse(UserCoupon::hasSameCoupon($this->testUserId, $couponName));
    }
}